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Which option gives a limitation of ligase enzyme?

Answer and explanation

Correct answer: It is not efficient without compatible and chemically proper ends

The governing concept is substrate-end compatibility in DNA ligation. Ligase does not freely join every pair of DNA ends. The ends must be positioned correctly, and the necessary chemical groups, especially a 5′-phosphate and a 3′-hydroxyl, must be available. Compatible sticky ends often base-pair and hold the fragments together, increasing the chance of sealing; incompatible ends or unsuitable chemistry make ligation inefficient. Therefore option A states a genuine limitation. Options B and C describe normal functions of ligase, while option D is also correct because ligase seals nicks during DNA replication. The limitation concerns reaction suitability, not absence of joining ability.

Related tags

Ligation LimitationCompatible Ends5 Prime PhosphateDna LigaseLigase EnzymesPrinciples Of BiotechnologyBiotechnologyClass 11 Mcq

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